Lizardtail is capable of emitting an aura which regenerates those in the area: causing wounds to close quickly and mend.Skitter notes that his power felt like being by the fire-side, just close enough to feel as though that 'heat' had a physical form, just close enough to be bearable. Instead of feeling hot however, the sensation is almost like a chill. The sensation was directional, making everyone aware of exactly where he was.
His power had a wide range, able to reach across a entire street. It may have also granted it's recipients enhanced durability and resistance to the wounding effects of other powers. It is unknown if it can discriminate between friend or foe but it can be repressed to some extent as Parian didn't feel it when they met.
Since healing abilities are very rare in Worm, it's likely Lizardtail's ability to regenerate others has a limited capacity.
The Ambassadors had another lizard-themed cape before Lizardtail; a man in a similar green dress shirt and copper lizard mask. He died fighting the Slaughterhouse Nine. This may be why Lizardtail's mask doesn't actually resemble a lizard.
↑ 4.04.1Lizardtail’s power was pressing against me, even from the other side of the street. It penetrated my costume to the skin, making my skin tingle and ensuring that I was always aware of where he was. It was like the sensation of standing in front of a fire, just close enough to feel as though that heat had a physical form, just close enough to be bearable. It wasn’t hot, though. It was cold, if anything. - Excerpt from Imago 21.6
↑Lizardtail’s power pressed even harder against me. I could feel the edges of my injuries tingling, the wounds slowly knitting closed. Far slower than they should have been, given the earlier demonstration of Lizardtail’s power. Either he was weaker, or her ability to inflict wounds that progressively got worse over time was taking away from the power of his regeneration.
Butcher had a grip on Regent, threw him into Biter with enough strength to take the two of them out of the fight.
Possibly enough strength to kill one, if Lizardtail’s power wasn’t able to outpace the internal damage done. - Excerpt from Imago 21.6
↑There -can- be very few people with healing abilities. Bonesaw, Scapegoat, Panacea. Others with niches (neurology only, or cardiac systems only), others still with limited capacity (Othala with the ability to grant regeneration).
↑The TV started making noise. Rey wheeled around to see Citrine and one of her fellow ‘ambassadors’ standing in front of the TV. The man in the suit with a green dress shirt and a copper lizard mask was the one turning up the volume.
The door slammed shut. Citrine had gone upstairs. The lizard-masked man watched the television.
The door at the top of the stairs closed. He turned to see that the lizard-man was being relieved. Had that much time passed already?
A body fell down the stairs. The man with the lizard mask. Dead, though not so mutilated. - Excerpt from Interlude 19.x